The population density of India from 1901 to 2011 is shown in Statement 31. At the beginning of the twentieth century i.e. in 1901 the density of India was as low as 77 persons per sq. km.This steadily increased in each decade to reach 382 persons per sq. km. in 2011.he population density of India from 1901 to 2011 is shown in Statement 31. At the beginning of the twentieth century i.e. in 1901 the density of India was as low as 77 persons per sq. km.
How they can cause insomnia: Alpha-blockers are linked to decreased REM (rapid eye movement) sleep â the stage of sleep when people dream â and daytime sedation or sleepiness. The proportion of REM sleep drops markedly in old age, and people deprived of REM sleep can experience memory problems.
Medical Causes of Insomnia. There are many medical conditions (some mild and others more serious) that can lead to insomnia. In some cases, a medical condition itself causes insomnia, while in other cases, symptoms of the condition cause discomfort that can make it difficult for a person to sleep. Examples of medical conditions that can cause insomnia are: 1  Nasal/sinus allergies. 2  Gastrointestinal problems such as reflux. 3  Endocrine problems such as hyperthyroidism. 4  Arthritis. 5  Asthma. 6  Neurological conditions such as Parkinson's disease. 7  Chronic pain. 8  Low back pain.